Inertia of Isolated Mass: Can it be Defined?

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SUMMARY

The discussion centers on the concept of inertia in relation to an isolated mass in the universe. It establishes that inertia, defined as the resistance to changes in motion, is intrinsically linked to mass. The conclusion drawn is that while an isolated mass possesses inertia, the absence of other masses means that external forces cannot be applied, complicating the practical definition of inertia in this scenario.

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If there is no mass in the universe but one isolated mass, can we define "inertia" for this mass?!
 
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Inertia is the resistance to a change in motion of an object when an external force is applied. Inertia is really just another word for mass in a physics sense. So yes, if it has mass it also has inertia.

Every force must have an equal and opposite reaction though, and since there are no other masses to react, there is no way to apply an external force.
 

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